2. Captain America
To date in the MCU, Captain America has been the epitome of discipline. His life has revolved around following orders and being part of organised groups in which everyone has a specified role. That is set to change in Captain America: Civil War. Captain America will rebel against such organisation. He believes superheroes have the right to control their own actions, rather than having to be told what to do by the government. This will be a Captain America unlike the one we know and love. Sure, Cap went up against "S.H.I.E.L.D." in Captain America: The Winter Soldier after HYDRA infiltrated it, but that was different - HYDRA were inherently evil. While his experiences in that movie make his lack of belief in the government understandable, it's still very much unlike the super soldier to defy orders - especially when it means going up against a bunch of people he used to call his friends.